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σ‐Homoconjugation in Cyclically Preoriented N4‐(Radical) Cations—N⋅⋅⋅N Bond Lengths >2 Å
Author(s) -
Exner Kai,
Großmann Birgit,
Gescheidt Georg,
Heinze Jürgen,
Keller Manfred,
Bally Thomas,
Bednarek Pavel,
Prinzbach Horst
Publication year - 2000
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(20000417)39:8<1455::aid-anie1455>3.0.co;2-w
Subject(s) - protonation , delocalized electron , bond length , chemistry , crystallography , electron delocalization , radical ion , photochemistry , electron , stereochemistry , ion , physics , organic chemistry , quantum mechanics , crystal structure
One needs their neighbors —especially when four nonbinding electon pairs are fixed elliptically on the same molecular side! In the cation 2 (see picture) and the violet radical cation, generated by protonation and by single‐electron oxidation, respectively, of the all cis ‐corsetted tetrazalodine 1 , σ‐delocalization exists between the N atoms of the tetrazane chain with bond lengths greater than 2 Å.